Kicker ZX400.1 MC14060 wont produce triangel wave - diyAudio
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Old 27th March 2012, 02:18 AM   #1
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Default Kicker ZX400.1 MC14060 wont produce triangel wave

This amp came in , with the protect light flashing . Changed out 2 640 fet's that were shorted on the output. Amp turned on was playing audio , but the amp was drawing current and would spike from 2-8 amps ( lm361 was getting hot ). Played audio for 5 minutes and then I started to hear a popping noise from the sub and then straight in to protect led was flashing. Remove all output fet's and amp turn's on (protect led doesn't come on). Remove Lm361 to see if pins where shorted , but they all measure high resistance . With Lm361 still out I wanted to see if I was going to get the triangle wave from MC14060 on pin4 and nothing as well from pin5 on the IC MC14060. With lm361 out I changed out MC14060 still no triangle wave on 5 , removed pin 5 from board to see if something was loading it but still nothing just sits at 0 volts. The crystal looks ok and the capacitors as well? Why I am not getting a triangle wave form ? Thank you Perry in advance !
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Old 27th March 2012, 02:24 AM   #2
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I have +and- 14 volts on ics and op amps .
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Old 27th March 2012, 11:24 AM   #3
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The 14060 doesn't produce the triangle waveform. It produces a square wave that's fed into an op-amp integrator. The op-amp produces the triangle waveform. Follow the signal from the 14060 to a resistor that feeds the inverting input of an op-amp.
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Old 27th March 2012, 11:47 AM   #4
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Yes I am sorry off the mc14060 pin 5 I am getting nothing flat line no 80khz square wave. After about 5 minutes with the amp on mc14060 pin 5 goes up to 14 volts but flat line ? Why am I not getting the square wave ? Thank you .
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Old 27th March 2012, 01:12 PM   #5
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MC14060 pins
9. 2.8
10. 8.5
11. 6.4

all flat lines no 2.56Mhz.
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Old 27th March 2012, 01:23 PM   #6
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For future reference... The IC terminals for the crystal can't always be probed. Often the scope loads the circuit and the oscillation stops. That's not a problem here because you didn't have output when you probed pin 5.

If there is any flux around the crystal, the small caps or the pins to the IC, you need to clean the area. Contaminants can prevent the crystal from oscillating.

Are the two small capacitors connected to the crystal intact?
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Old 27th March 2012, 01:38 PM   #7
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Ok . No flux I always clean my work with acetone ( like in your videos in the dvd) . Yes the capacitors are connected and intact .
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Old 27th March 2012, 03:40 PM   #8
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If the IC is new and has supply voltage, I'd suspect the crystal or one of the caps connected to the crystal.
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Old 28th March 2012, 01:21 PM   #9
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One of the caps was bad , changed out with .1uf and still nothing. Changed out the crystal , with one from another amp, but I don't know if that one was a good part ? Still nothing out of pin 5 ? If I need to order a crystal where could I order these from through hole type all I can find are these http://search.digikey.com/scripts/Dk...nator+2.56+mhz. Thank you .
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Old 28th March 2012, 03:57 PM   #10
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Which cap was bad?
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